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O

THName: Fatin Najiha Abu BakarClass : 2 Feminin 2009

Title : Growth Chapter 5

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growth

1. Growth is a life process that occurs in all types of life.2. Growth can be defined as: > Increase in body size > Increase in number of cells > Increase in weight

> Changes in body shape > Changes in function of an organism

3. The growth of an unicellular organism involves: > Increase in size of a cell > Increase in mass of a cell

4. The growth of a multi cellular organism involves: > Increase in the number of cells > Increase in the size of the organism especially in: a) height b) weight

1.2.

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> Changes in appearance > Changes in physical characteristics > Develop the complexity and function of the

organism5. The process of growth in an organism is permanent and

irreversible.

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The characteristic of human

growth

1. The human growth pattern is asigmoid curve.

2. It is divided into five stages of

growth: a) Infancy b) Childhood c) Adolescence d) Adulthood e) Old age

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1. The human growth curve is obtained byplotting the height or weightagainst time.

2. The rate of growth is the difference inweight at suitable over a period oftime.

3. Therefore, the gradient of the curveindicates the rate of that particularperiod.

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INFANCY - CHILDHOOD ADOLESCENCE

ADULDHOOD - OLD

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1. The rate of growth in human is the fastest, during: a) the development of foetus in the uterus. b) the first six month after birth

2. An infant grows very quickly in the first three year.3. Childhood is a period of slow growth.

4. The adolescence is a period of very quick growth a)Sexual maturity or puberty is achieved during

adolescence

b) The teen years are adolescent period5. Adulthood covers the early 20s until about 65. It is of

minimal growth.

6. Old age is the period of negative growth. a) negative growth means loss in weight b) tissues in the body break downs more quickly than

they can be repaired

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Stages Growth pattern

Infancy( early stage )

0 to 3 years

Rapid growth until three years of ageWeight doubles after six monthsWeight triples after one year

Childhood

3 to 12 year of ageSlow growth until adolescent stage

Adolescence12 to 20 years of ageTeen yearsGrowth rate increaseSexual maturity or puberty achieved during

this stageAdulthood

Starts from about 20 years of ageGrowth rate slows downMaximum growth achieved and growthstops

Old ageGrowth rate becomes negativeHeight and weight decrease slightly

Death at old age

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Stages Comparison

Infancy( early stage )

Growth rates for baby and girls are generally

the sameChildhood

From fouryears old a boys growth rates is fasterthan a girlsterm of weight

Adolescence Girls reach puberty at the age of 12

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